1.47 In a ready-mix plant, cylindrical samples are prepared and tested periodically to detect any mix problem and to ensure that the compressive strength is higher than the lower specification limit. The minimum target value was set at 5,000 psi. The compressive strength data shown in Table P1.47 were collected. a. Calculate the mean, standard deviation, and the coefficient of variation of the data. b. Using a spreadsheet program, create a control chart for these data showing the lower specification limit. Is the plant production meeting. the specification requirement? If not, comment on possible reasons. Comment on the data scatter.

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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Subject is properties of behavior
you believe the contractor's
Why? (Hiht. Use statist
t-test.)
1.47 In a ready-mix plant, cylindrical samples are prepared and tested
periodically to detect any mix problem and to ensure that the compressive
strength is higher than the lower specification limit. The minimum target
value was set at 5,000 psi. The compressive strength data shown in Table
P1.47 were collected.
a. Calculate the mean, standard deviation, and the coefficient of
variation of the data.
b. Using a spreadsheet program, create a control chart for these data
showing the lower specification limit. Is the plant production meeting
the specification requirement? If not, comment on possible reasons.
Comment on the data scatter.
Transcribed Image Text:you believe the contractor's Why? (Hiht. Use statist t-test.) 1.47 In a ready-mix plant, cylindrical samples are prepared and tested periodically to detect any mix problem and to ensure that the compressive strength is higher than the lower specification limit. The minimum target value was set at 5,000 psi. The compressive strength data shown in Table P1.47 were collected. a. Calculate the mean, standard deviation, and the coefficient of variation of the data. b. Using a spreadsheet program, create a control chart for these data showing the lower specification limit. Is the plant production meeting the specification requirement? If not, comment on possible reasons. Comment on the data scatter.
Table P1.47
Sample No.
1
2
3
4
LO
5
6
7
8
9
10
Compressive Strength (psi)
5595
5139
6359
5192
5188
5241
5964
5875
6155
5115
Sample No.
11
12
13
14
15
16
17
18
19
20
Compressive Strength (psi)
6695
5449
5278
6697
5195
6021
5320
5657
6595
5235
Transcribed Image Text:Table P1.47 Sample No. 1 2 3 4 LO 5 6 7 8 9 10 Compressive Strength (psi) 5595 5139 6359 5192 5188 5241 5964 5875 6155 5115 Sample No. 11 12 13 14 15 16 17 18 19 20 Compressive Strength (psi) 6695 5449 5278 6697 5195 6021 5320 5657 6595 5235
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